diff --git a/.github/workflows/run_unit_tests.yml b/.github/workflows/run_unit_tests.yml
index 5b6258a..927d04c 100644
--- a/.github/workflows/run_unit_tests.yml
+++ b/.github/workflows/run_unit_tests.yml
@@ -19,7 +19,8 @@ jobs:
           "3.10",
           "3.11",
           "3.12",
-          "3.13"
+          "3.13",
+          "3.14"
         ]
 
     steps:
diff --git a/pyproject.toml b/pyproject.toml
index 09993c3..dcabe36 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,6 +26,7 @@ classifiers = [
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
 ]
 dependencies = [
     "numpy>=1.19",
@@ -41,10 +42,10 @@ gcp = ["dataclasses>=0.8; python_version=='3.6'", "google-auth>=1.6"]
 
 [dependency-groups]
 test = [
-    "mypy==0.982",
+    "mypy==1.18.2",
     "flake8==6.1.0",
-    "pytest==7.1.3",
-    "pytest-cov==3.0.0",
+    "pytest==9.0.1",
+    "pytest-cov==7.0.0",
     "pytest-flake8==1.1.3",
     "pytest-localserver==0.5.0",
     "types-requests==2.27.14",
diff --git a/src/dicomweb_client/file.py b/src/dicomweb_client/file.py
index 612c1f1..b1a421d 100644
--- a/src/dicomweb_client/file.py
+++ b/src/dicomweb_client/file.py
@@ -461,7 +461,7 @@ class _QueryResourceType(Enum):
 
 
 def _build_acceptable_media_type_lut(
-    media_types: Tuple[Union[str, Tuple[str, str]], ...],
+    media_types: Tuple[Union[str, Tuple[str, ...]], ...],
     supported_media_type_lut: Mapping[str, Iterable[str]]
 ) -> Mapping[str, Iterable[str]]:
     # If no acceptable transfer syntax has been specified, then we just return
diff --git a/src/dicomweb_client/log.py b/src/dicomweb_client/log.py
index 746e1c8..512e0e2 100644
--- a/src/dicomweb_client/log.py
+++ b/src/dicomweb_client/log.py
@@ -3,7 +3,7 @@
 import logging
 
 
-def _filter_header_parsing_error(record: logging.LogRecord) -> int:
+def _filter_header_parsing_error(record: logging.LogRecord) -> bool:
     """Filters warnings of ``urllib3.exceptions.HeaderParsingError``.
 
     Parameters
@@ -13,13 +13,13 @@ def _filter_header_parsing_error(record: logging.LogRecord) -> int:
 
     Returns
     -------
-    int
-        zero if the record should be filtered, non-zero otherwise
+    bool
+        False if the record should be filtered, True otherwise
 
     """
     if 'Failed to parse headers' in record.getMessage():
-        return 0
-    return 1
+        return False
+    return True
 
 
 def _map_logging_verbosity(verbosity: int) -> int: